Free Online Tools

Calculators for finance, health, home projects and developer tools

Finance and income

Income Tax Calculator

Estimate Thai progressive income tax on salary

Salary Calculator

Calculate take-home pay after deductions

Overtime Calculator

Estimate overtime from wages and a multiplier

Mortgage Calculator

Estimate monthly amortized mortgage payments

Interest Calculator

Compare simple and compound interest

Loan Calculator

Calculate amortized or flat-rate loan payments

Health

BMI Calculator

Calculate body mass index from weight and height

Home and measurements

Electricity Calculator

Estimate appliance energy consumption and cost

Unit Converter

Convert length, area, mass, volume and temperature

Area Calculator

Calculate rectangle, triangle and circle areas

Materials and construction

Material Calculator

Estimate material quantities using coverage per piece

Paint Calculator

Estimate paint liters and cans based on coats

Concrete & Mortar Calculator

Estimate concrete volume or premixed mortar bags

Tile Calculator

Estimate tile pieces, boxes and cost

AI Tools

AI Prompt Builder

Type a short idea → AI expands into a detailed prompt

AI Project Consultant

Chat with AI to plan your project and get a Project Brief

PDF Tools

Merge PDF Files

Combine multiple PDF files into one, reordering them before merging

Split PDF Files

Split a PDF into separate files by page range, downloaded instantly

Remove PDF Pages

Delete unwanted pages from a PDF file

Extract PDF Pages

Pull specific pages out of a PDF into a new file

Organize PDF Pages

Drag to reorder, rotate, or delete PDF pages with a visual preview

Rotate PDF Pages

Rotate all or selected PDF pages by 90, 180 or 270 degrees

Add Page Numbers to PDF

Automatically number PDF pages with your choice of position and start number

Add Watermark to PDF

Stamp a text watermark on every page with custom color, size, opacity and angle

Crop PDF Pages

Trim the margins of every PDF page by a custom amount on each side

Convert JPG to PDF

Turn multiple JPG or PNG images into a single reorderable PDF

Convert PDF to JPG

Render every PDF page into a JPG image, downloaded one by one

Developer / Programmer Tool

JSON Formatter / Validator

Paste JSON → Format + Validate errors

Thai Keyboard Layout Converter

Fix text typed with wrong keyboard layout (forgot to switch language)

Base64 Encode / Decode

Convert image to Base64 or decode back

JWT Decoder

Paste Token → View payload instantly

UUID / API Key Generator

Generate UUID and API Keys

Web / Design Tool

HTML to PDF Converter

Convert HTML to PDF via Print dialog

Color Picker for Brand

Pick colors in HEX / RGB / Tailwind

CSS Generator

Generate Shadow, Gradient, Border

URL Shortener + QR Code

Shorten long links, pick a custom alias, get a QR code

Mobile / App Tool

App Feature Checklist Generator

Generate app feature checklist

Release Notes Generator

Generate Release Notes in Thai/English

SEO + Marketing Tool

Meta Tag Generator

Generate Meta Tags for SEO

Project Name Generator

Generate Tech-style project names

Address

TNGroup soft thailand Mueang District, Maha Sarakham

Phone

093-3381817

Email

Tngroupsoft@gmail.com

Social

LINE Official

Scan QR to add LINE

@966sclod

Account: TNGroup Soft TH